vboot_ref/Makefile: Expose symbols irregardless of USE_FLASHROM

subproccess helpers are only used by flashrom.c at the moment. However we
temporarily need the symbols to bridge the gap with cbfstools/elogtool in
upstream coreboot. Furthmore, there are new additional use-cases for
subproccess in other parts of vboot_reference unrelated to flashrom
directly.

BUG=b:231152447
BRANCH=none
TEST=builds

Change-Id: Id8008eefd46efa329adf76323800bb7646bf922c
Signed-off-by: Edward O'Callaghan <quasisec@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/3697856
Tested-by: Edward O'Callaghan <quasisec@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Commit-Queue: Julius Werner <jwerner@chromium.org>
Auto-Submit: Edward O'Callaghan <quasisec@chromium.org>
1 file changed